Which submersed weed is categorized as rooted without floating leaves?

Egeria, also known as Brazilian elodea, is correctly categorized as a submersed aquatic plant that is rooted and does not produce floating leaves. It primarily grows in submerged conditions and has a structure that consists of elongated stems and whorled leaves, which are fully submerged under the water, making it distinct from other aquatic plants that may have floating leaves at the surface.

Quillwort is a different type of aquatic plant that has a unique structure, and while it may be submersed, it does not fit the criteria of being rooted without floating leaves in the same manner as Egeria. Sago pondweed, while being a submersed plant, generally features leaves that can be floating or submersed, depending on the growing conditions, and many species often have some floating growth. Coontail is another submersed aquatic plant, but it also exhibits a branching growth habit that can extend to the surface, making it more distinct in its characteristics and not strictly categorized as rooted without floating leaves.

Understanding the specific characteristics of these plants reinforces the classification of Egeria as the correct answer. Its growth form, habitat preferences, and reproductive strategies align perfectly with the definition provided in the question.